Question

In ∆ABC, if sin A = 4/5 and tan A = 4/3 , then what is cos A?
I don't understand this at all, please help.

Answer 1

do you have a diagram?

Answer 2

That is the triangle in which sin A= 4/5 and tan A = 4/3
What is the definition of cosine?

Answer 3

All I know is that cosine is it is Adjacent / Hypotenuse.

Answer 4

And, in the given triangle, what is the side adjacent to angle A?

Answer 5

Angle C?

Answer 6

So, your problem may be that you don't know the difference between sides and angles?

Answer 7

Yeah, I got confused with the definition. Thank you for your help.